diff --git a/testing/conn_mock_test.go b/testing/conn_mock_test.go
index b77bd063a45b685fcabe9b76d3cc02ead5f8663e..9d964ffa9fecef3f577dd02c498ed9dc110bcf1b 100644
--- a/testing/conn_mock_test.go
+++ b/testing/conn_mock_test.go
@@ -22,7 +22,7 @@ func TestRead(t *testing.T) {
 	m.Bytes = payload
 
 	buffer := make([]byte, 4)
-	m.Read(buffer)
+	n, _ := m.Read(buffer)
 
-	assert.Equal(t, payload, buffer[:3])
+	assert.Equal(t, payload, buffer[:n])
 }